Questions about sealing cylinders

[Jonasand]

I have a couple of questions after reading about how to seal cylinders.

Cylinder to Head
Am I right that I should not have any sealant between head and cylinder,
only lap with valve grinding compound?
I read SGKent uses copper spray gasket on the head mating surface too help until there is carbon buildup to help seal properly.

I have a couple of scratches on my head mating surfaces,
I'd like to know if this will be a problem and cause leaks or not.
Or if these scratches warrant some kind of sealer to even out even though you normally shouldn't use a sealer?

see pic below

Cylinder to Case

When it comes to cyliner to case, I am not able to lap the cylinders, since I still have the mounting bolts for the cylinders and heads screwed into the case. I'm afraid that if I unscrew them I wont get them back without opening the case.

Will I still be able to seal without lapping cylinder bases?

As for sealant, I have Curil T2, Hylomar Blue and Permatex aviation no 3 at my disposal.
It is my understanding that most people use High temperature RTV though.

I don't have High temp RTV yet (as always its a bit hard to find the brands that are popular in the US here in Sweden so hard to know what is good quality)

will something like this do?
https://www.wurth.se/produkter/kemi/fogmassa/silikon/hogtemperatur/rtv-silikon-super-rtv-plus/#/

Or will it work just as good to use Curil T2, Hylomar or Permatex no 3?

When using either Curil T2, Hylomar, RTV on cylinder bases, should I apply on one side or on two sides of the shim?

Also I read that Curil T2 has replaced both Curil K2 and Curil T. Haven't heard it mentioned before on the forum so I thought I'd just mention it.

Thank you for helping me!
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79 Baywindow, currently rebuilding engine
Type 4 2.0 L FI
Hydraulic lifters

[Glenn]

The cylinder slips into the head, that's not the mating surface.

I just built a new Type 1 engine and used Permatex Right Stuff on the base. It's good to 500*F and doesn't shrink.
_________________
Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"

Member #1009

#BlueSquare

[cmonSTART]

Yup, those scratches don't matter for sealing - not the sealing surfaces.

This stuff is great:

https://www.autozone.com/sealants-glues-adhesives-...520940_0_0
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'78 Bus 2.0FI
de K1IGS

[Wildthings]

You lap the cylinders to the heads and not to the case. If the heads have been resurfaced then lapping to cylinders to the heads should not be necessary.

[Jonasand]